 * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
 a {
    text-decoration: none;
    color: inherit;
  }
 ul,ol {
   list-style: none;
 }
 button,input {
   font:inherit;   /*设置它的字体是继承的*/
 }
 :focus {
   outline:none
 }
 h1,h2,h3,h4,h5,h6 {
   font-weight: normal;
 }